Ex liked this photo that a girl put up with regards to sex?

And I know you'll be like, so what, he's your ex? But point is, I still miss him and hope we might reconcile at some point.

Anyway, he liked this particular photo that an attractive girl posted, and I guess I'm just wondering if it's a completely sarcastic remark meaning the person has been getting LOTS of sex or if it basically just means that the person has been receiving no sex at all for a long time.